Optical fiber system and method for carrying both CATV and Ethernet signals
a technology of optical fiber and ethernet, applied in the field of optical fiber system and method, can solve the problems of high cost, low bit rate of digital signals, complex devices, etc., and achieve the effects of saving the cost of optical signal system, low channel loss, and high capacity
Inactive Publication Date: 2006-03-30
NAT CENT UNIV
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[0009] In the present invention, the digital signals are translated into higher band by a direct up / down conversion so that the analog signals and the digital signals are treated as different frequency bands of electronic signals. Then, all the signals are mixed / divided by a power combiner / divider. And then, by using optoelectronic devices, the signals are processed with an optoelectronic conversion. And, the converted optical signals are transmitted in a fiber or a related optical channel having low channel loss yet high capacity. So, the present invention can transmit digital signals together with analog signals in a single optical wavelength to save the cost of an optical signal system and to provide a convenience on rearranging the system. And, the present invention can be applied to a digital fiber network communication system, a fiber CATV system or a passive fiber network system.
Problems solved by technology
So, the device is more complex and the cost is relatively higher.
But the bit-rate of the digital signals is still low and the signal process it involves is complex.
Method used
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[0027] The following descriptions of the preferred embodiments are provided to understand the features and the structures of the present invention.
[0028] Please refer to FIG. 1, which is a system diagram according to an embodiment of the present invention. As shown in the figure, the present invention is an optical fiber system and method for carrying both CATV and Ethernet signal, comprising a transmitting part 1, a receiving part 2 and an optical channel 3, where the optical channel 3, such as a glass fiber, a plastic fiber or a free space, is a channel for transmitting signals. According to the embodiment, in a first transmitter 11 of the transmitting part 1, signals of a first signal source 111 are transmitted to a low-pass filter 112 for transmission to be transmitted to a power combiner 13. In a second transmitter 12 of the transmitting part 1, signals of a second signal source 121 are up-converted to an RF (radio frequency) band by adding an RF carrier 124 of 1.8 GHz (giga-h...
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The present invention is an optical fiber system and method for carrying both CATV and Ethernet signals. The digital signals are translated into higher band by a direct up / down conversion so that analog signals and digital signals are treated as different frequency bands of electrical signals. Then, all the signals are mixed / divided by a power combiner / divider. And then, by using optoelectronic devices, the signals are processed with optoelectronic conversion. The converted optical signals are transmitted in a fiber or a related optical channel having low channel loss yet high capacity. To sum up, the present invention can transmit digital signals together with analog signals in a single wavelength to save the cost of an optical signal system and to provide a convenience on rearranging the system.
Description
FIELD OF THE INVENTION [0001] The present invention relates to an optical fiber system and method; more particularly, relates to, through a direct up / down signal conversion and by using filters and power combiner / divider, electrical signals with different transmitting frequencies are integrated. Then, the signals are processed with an optoelectronic conversion through an optoelectronic device. And then, the signals are transmitted through an optical fiber or a related optical channel, which is characterized in low channel loss yet high capacity. The present invention can be applied to a fiber digital network communication system, a fiber CATV (cable television) system or a passive fiber network system. DESCRIPTION OF THE RELATED ARTS [0002] Owing to the requirement of diversification and the requirement of a high-speed transferring rate for the network service nowadays, digital signals and analog signals can be delivered in the same channel (i.e. an optical channel) at the same time...
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CPCH04B10/25751
Inventor CHAN, YI-JENHUANG, FAN-HSIUWANG, HSIN-PINLIN, DONG-MINCHU, MU-TAOLEE, SHIN-GELEE, SHUN-TIEN
Owner NAT CENT UNIV